Hi Val,
there is a list of the victims of political repressions: https://ru.openlist.wiki/%D0%A1%D0%BB%D1%83%D0%B6%D0%B5%D0%B1%D0%BD%D0%B0%D1%8F:OlSearch
What are the first/last names of your grandfathers? 

Elena Boldyreva,
Toronto, Canada.
Searching for Rogovins/Ragovins/Rogowins from Minsk guberniya